Two-Block System
PANEL LIGHT & HORN WILL NOT COME ON WITH BOOM SWITCH WEIGHT
LIFTED (IF EQUIPPED WITH DISCONNECTS, CONTROLS WILL NOT ENGAGE)
CAUSE REMEDY
Burned out fuse Check and replace fuse (8 amp only).
Broken wire Check voltage in control panel between
terminals #0 and #37. If 0 volts, check
between ignition post of ignition switch and
ground. If 12 volts available, wire to control
panel is bad. Correct.
HORN WORKS, BUT NO LIGHT WITH SWITCH WEIGHT LIFTED (AND IF
EQUIPPED W/ DISCONNECTS, CONTROLS WILL ENGAGE)
CAUSE REMEDY
Light bulb burned out Replace bulb
LIGHT AND HORN ARE ON WITH HOOK BLOCK NOT CONTACTING SWITCH
WEIGHT (IF EQUIPPED W/ DISCONNECTS, CONTROLS WILL NOT ENGAGE)
CAUSE REMEDY
Jumper wire or jib/rooster sheave not
plugged in boom head
Plug in.
Boom head weight wire rope broken or hung
up
Check that weight is attached to wire and
hanging freely. If rope is caught up on
something, correct
Jib or auxiliary boom head switch plugged
in, but no weight
Attach weight
Broken electrical cable or bad connection Check all cable for visible damage, then
remove wire from terminals #3 and #6 in
control panel and check for continuity. If
circuit is open, check the wires inside cable
reel, and wires from the reel to the boom
head switch. If the wires are OK, check the
anti-two block switch. If there is continuity
between #3 and #6 check the relay in the
panel.
Defective two block switch Check for correct mechanical operation. If
OK, remove cover and wires from terminals
#1 and #2. With arm pulled down, there
should be a closed circuit between them.
With the arm up, the circuit should be open.
If all conditions are not met, replace switch.
429P/N 12261-683 REVISED: January 2015
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